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A nonce is a variable number that miners substitute when hashing a block. By going through nonce values, they search for a hash that satisfies the target set by the network's difficulty.

A node is a computer with an installed client connected to a cryptocurrency network. Nodes exchange data, relay transactions and blocks and jointly maintain the operation of the decentralized network.

Namecoin is one of the first altcoins, created on the basis of Bitcoin's technology. Its purpose is the decentralized registration of names and domains, primarily in the censorship-resistant .bit zone.

A block reward is the reward a miner receives for successfully creating a new block in the blockchain. It consists of an issuance part and transaction fees and decreases periodically.

Multisignature is a technology in which carrying out a transaction requires not one but several signatures with different private keys. It noticeably increases the security of storing crypto assets.

Mt. Gox is one of the first and largest Bitcoin exchanges, based in Japan. Its closure after a major loss of funds became one of the most famous events in the history of cryptocurrencies.

A millibitcoin (mBTC) is one thousandth of a bitcoin, that is, 0.001 BTC. This fractional unit is used to conveniently display small amounts in this cryptocurrency.

A microtransaction is a payment of a very small amount, often less than the minimum monetary unit. Such operations are unprofitable for traditional payment systems because of fees, while cryptocurrencies make them feasible.

A merchant account is a special trade account for a business used to accept non-cash payments by cards and over the internet. It links the seller to the payment infrastructure and the acquiring bank.

A merchant is a trade or service business that accepts payment cards and, in many cases, cryptocurrencies. The term comes from the English word merchant.